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Glycolosis is the first stage in the process of cellular respiration. Hartnell College explains that glycolosis is a process that takes place inside a cell, in which glucose is split into simpler molecules. Although glycolosis does not require oxygen, Hartnell College explains that oxygen is vital for the processes that follow it. The process that follows glycolosis, which is known as the citric acid cycle (or Krebs cycle), provides energy that is used to transport electrons across the cell membrane, according to About.com.